21... d8b6  22. b2b4 An excellent prophylactic move, preventing Black's knight from going to c5. White's position has improved, and he now has the typical microadvantage that is promised by the Two Knights Variation of the Caro-Kann. 22... e6e5  23. h3h4 A somewhat mysterious move, although it doesn't change much, given the slow character of the position. 23... b8a8 